Cobb County, GA Noise Ordinances: Vehicle Noise (2026)
Key Facts
- Governing section
- Cobb County Code § 50-258(6) and (7)
- Applies in
- Unincorporated Cobb County only, not Marietta or other cities
- Exhaust rule
- Muffler required to prevent loud or explosive engine noise
- Vehicle-defect rule
- Out-of-repair or overloaded vehicles causing loud noise banned
- Generator exception
- Medical emergencies, power outages, and routine testing are exempt
- Penalty
- Misdemeanor fine and/or jail under § 1-10, O.C.G.A. § 15-10-60
- Overlapping state law
- O.C.G.A. §§ 40-6-14 (stereo volume) and 40-8-71 (mufflers)
Summary
Cobb County makes it unlawful, in the unincorporated county, to let exhaust escape without an effective muffler or to drive a vehicle so out of repair or loaded that it grates, grinds or rattles loudly. County Code § 50-258(6)-(7) singles out engine and vehicle noise separately from the article's general 70/65 dBA limit, with violations punishable as misdemeanors under § 1-10.
(6)Exhausts. The discharge into the open air of the exhaust of any steam engine, internal-combustion engine or motorboat except through a muffler or other device which will effectively prevent loud or explosive noises therefrom. This shall include internal-combustion generators except those specifically utilized in medical emergencies, during power outages, or those being tested or maintained for ongoing general upkeep.(7)Defect in vehicle or load. The use of any automobile, motorcycle or vehicle so out of repair, so loaded, or in such manner as to create loud grating, grinding, rattling or other noise.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 53).
Full Breakdown
Article VII of the Cobb County Code (Chapter 50) enumerates specific noises 'declared to be loud, disturbing and unnecessary' within the unincorporated county, and vehicle exhaust and vehicle defects each get their own paragraph. ' The same paragraph reaches internal-combustion generators, though it carves out generators used in a medical emergency, run during a power outage, or being tested or maintained for routine upkeep. Section 50-258(7), 'Defect in vehicle or load,' separately bans operating 'any automobile, motorcycle or vehicle so out of repair, so loaded, or in such manner as to create loud grating, grinding, rattling or other noise,' covering rattling trailers, dragging mufflers and overloaded trucks as much as gutted exhaust pipes.
Paragraph (14) of the same section adds motorcycles, motorized scooters and go-carts operated 'in a manner which creates excessive noise,' including repeated laps past an inhabited dwelling. These vehicle-specific bans sit apart from the article's general 70 dBA daytime and 65 dBA nighttime ambient limit in § 50-257(b): a vehicle can violate (6), (7) or (14) on the character of the sound itself, with no decibel meter reading required. § 40-6-14 caps how far a vehicle stereo can be heard, and § 40-8-71 requires mufflers on motor vehicles statewide, so a loud stereo or a bad muffler can draw both a county citation and a state charge.
Under § 50-257(a), any violation of Article VII within the unincorporated county is punishable under the Code's general penalty section, § 1-10. Section 50-259 exempts county-licensed businesses already regulated for nuisance, county-funded projects, school-sponsored activities on school grounds, and any activity separately permitted by state or federal law.
Violations & Fines
A violation is a misdemeanor under § 1-10(c), punishable by a fine and a sentence of imprisonment and/or probation up to the maximum a Georgia court can impose under O.C.G.A. § 15-10-60; the fine doesn't bar the county from also revoking a related business license or permit. Because § 1-10(e) treats a continuing violation as a nuisance, Cobb can seek injunctive or other equitable relief against repeated offenses, such as a shop that keeps running unmuffled equipment, in addition to pursuing a criminal citation.
Frequently Asked Questions
Does Cobb County's vehicle exhaust rule apply inside Marietta or Smyrna?
What makes a car's exhaust illegal under Cobb County's noise ordinance?
Can a rattling truck or trailer get cited even without a broken exhaust?
Are loud car stereos covered by the county's noise rules?
What's the penalty for a first vehicle-noise violation in unincorporated Cobb County?
Sources & Official References
Other rules in Cobb County
Compare Cobb County to another location·View the Georgia noise ordinances overview
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